Pretty sure.......

Topic: Pretty sure....... (Read 16665 times) previous topic - next topic

Pretty sure.......

Reply #45 – February 21, 2016, 09:32:04 AM

ive been watching this thread, I wanted to chime in a few times but I know you like to think things through for a while before you do a project.

just fyi,, many people get rod noise early on. I started getting all kinds of noise a 100k miles ago I guess at 190k... ive been running rotella 15-40 and that solved the noise problem. I also change my oil once and sometimes twice a month also.

my machine shop local to me said he prefers thin oil for better protection though,,, which confuses me. I tried to debate the hydraulic effect of thicker vs thinner oil but he says im wrong. ,, he's the expert so I digress.

all I know is that I have no noise now.

Pretty sure.......

Reply #46 – February 21, 2016, 10:16:02 AM

Yesterday was nice so I took the Cobra Jet out for a good hard run with several WOT pulls through the gears and noticed oil pressure was at 22 psi with idle around 900 RPM, has a 180* stat... I stopped by a friends and just let it run(battery is iffy), and of course I bla bla for 45 minutes or more while it ran... When I got in to leave pressure was almost 30psi or what's normal for the tired old 428... Difference??? Oil cooled while idling so pressure came back to what I usually see... When oil was cold pressure was over 60psi at same speed... The pan is currently filled with QS Defy 10W-40... This change is approaching three years(but less than 1K mi), I'll soon treat the old girl to a fresh dose of same...

Scott if clearances are over the max recommended, thicker oil will take up the slack so to speak and if it's stopping noise(s), you're doing the right thing... A fresh engine that's a bit on the tight side or even dead center of recommended clearance, should never really need more than a 0/5W-30...

Pretty sure.......

Reply #47 – February 21, 2016, 01:12:42 PM

Quote

Scott if clearances are over the max recommended, thicker oil will take up the slack so to speak and if it's stopping noise(s), you're doing the right thing... A fresh engine that's a bit on the tight side or even dead center of recommended clearance, should never really need more than a 0/5W-30...

Yup. It'll actually shear the oil. No good. I'm actually gonna try the Mobil 1 10-50 next time out. Should be OK.

Pretty sure.......

Reply #48 – February 21, 2016, 04:19:21 PM

My understanding is its all in the build
Build up a motor tight and run lighter oil and make more HP, spin faster, probably need a HV oil pump though
A motor with looser clearances will of course need heavier oil
I believe Nascar runs something like 0w20 or 5w20

Pretty sure.......

Reply #49 – February 21, 2016, 04:22:12 PM

Most new fords run 0w20 or 5w20.

It pretty much has to do with bearing clearances when the motor is built and operational temps. If you live in Florida, there isn't much reason to run a winter rated oil.

Pretty sure.......

Reply #50 – February 21, 2016, 06:37:36 PM

Quote from: Haystack;453960

Most new fords run 0w20 or 5w20.

It pretty much has to do with bearing clearances when the motor is built and operational temps. If you live in Florida, there isn't much reason to run a winter rated oil.

Actually it pretty much has to do with improving corporate CAFE numbers and why Ford back specked several models(actually most) to use 5W-20... They received three years back credit on their CAFE averages... All the US vehicles that have exact foreign counterparts are recommended to use anything from 0/5W-20 to 20W-50... Some aren't recommend for anything less than 10W-30/40...

Still there aren't many engines that really need anything thicker than a quality 5W-30... At one time 5W-30 was only recommended for temps under 60*F but with advancement in VII(viscosity index improvers), these oils hold up quite well for 4-5K mi oil changes... Prior they would shear at higher temps leaving you with a 5W-10 or similar equivalent(which is fine in very cold weather)...

Pretty sure.......

Reply #51 – February 21, 2016, 09:35:29 PM

I've been running 10W30 in my Thunderbird since the engine was rebuilt 9 years ago. After the 500 mile break in on regular oil I've been running Mobile 1 without issue. I also run 10W30 in my Mark VII. My Focus and my wife's Mustang get 5W20, as that's what the manual calls for. Ford specified 10W30 for the 5.0 so that's what I run.

Pretty sure.......

Reply #52 – February 21, 2016, 10:58:05 PM

Quote from: thunderjet302;453968

I've been running 10W30 in my Thunderbird since the engine was rebuilt 9 years ago. After the 500 mile break in on regular oil I've been running Mobile 1 without issue. I also run 10W30 in my Mark VII. My Focus and my wife's Mustang get 5W20, as that's what the manual calls for. Ford specified 10W30 for the 5.0 so that's what I run.

Mobil 1 5W-30 is thicker at 100*C than their 10W-30... Compare the cSt and you'll see what I'm referring to... There's enough difference that I won't touch their 10W-30, isn't much more than a 10W-20...

https://mobiloil.com/en/motor-oils/mobil-1/mobil-1

Pretty sure.......

Reply #53 – February 22, 2016, 08:13:57 AM

Quote from: TurboCoupe50;453970

Mobil 1 5W-30 is thicker at 100*C than their 10W-30... Compare the cSt and you'll see what I'm referring to... There's enough difference that I won't touch their 10W-30, isn't much more than a 10W-20...

https://mobiloil.com/en/motor-oils/mobil-1/mobil-1

The viscosity rating at 100° C. is one of the first thing gs I look at.

Pretty sure.......

Reply #54 – February 22, 2016, 02:20:52 PM

Mobil 1 best all around oil is no doubt their 0W-40, has numerous certifications that most oils can't touch... Plus it has a good load of ZDDP and is a light 40, just barely out of 30W territory, far thinner than most 10W-40... If you wanted to cut it a bit, mix in a quart of their 5W-20 EP and you'll have a 30W that's on the upper end of scale... This is the oil I used in the supercharged Marauder...

The Mobil 1 5W-30 high mileage is another oil with extra zinc, SL rated so isn't reduced like SM & SN oils(have it in my '98 Grand Marquis)... Note the xxW-40 grades aren't effected by zinc reduction mandate, still most oils have been cut to approx same as the xW-20/30...

Pretty sure.......

Reply #55 – February 22, 2016, 05:59:33 PM

Quote from: TurboCoupe50;453970

Mobil 1 5W-30 is thicker at 100*C than their 10W-30... Compare the cSt and you'll see what I'm referring to... There's enough difference that I won't touch their 10W-30, isn't much more than a 10W-20...

https://mobiloil.com/en/motor-oils/mobil-1/mobil-1

Comparing Mobil 1 to other 10W30s:

Valvoline Synpower: http://content.valvoline.com/pdf/synpower.pdf

Penzoil Platinum: http://www.pennzoil.com/wp-content/uploads/2014/04/Pennzoil-Platinum-10W-30-Full-Synthetic-Motor-Oil-SN-GF-5-en-TDS.pdf

Royal Purple: http://www.royalpurpleconsumer.com/wp-content/uploads/PS_API_MotorOIl.pdf

They are all pretty close. I doubt that running any of the other 3 over Mobil 1 would make a difference. The engine seems happy with 10W30 so I see no need to switch to something like 10W40.

Pretty sure.......

Reply #56 – February 22, 2016, 08:10:08 PM

glad you got the car out for a stretch tom,, I was gonna steal it soon If anymore dust collected.

Pretty sure.......

Reply #57 – February 22, 2016, 10:59:23 PM

Quote from: thunderjet302;453981

Comparing Mobil 1 to other 10W30s:

Valvoline Synpower: http://content.valvoline.com/pdf/synpower.pdf

Penzoil Platinum: http://www.pennzoil.com/wp-content/uploads/2014/04/Pennzoil-Platinum-10W-30-Full-Synthetic-Motor-Oil-SN-GF-5-en-TDS.pdf

Royal Purple: http://www.royalpurpleconsumer.com/wp-content/uploads/PS_API_MotorOIl.pdf

They are all pretty close. I doubt that running any of the other 3 over Mobil 1 would make a difference. The engine seems happy with 10W30 so I see no need to switch to something like 10W40.

None of those oils give me a fuzzy feeling, if I don't see at least a 11.0 cSt@100*C, I move on... Also HTHS@150*C is important(especially in a boosted engine), I kinda live with oils around the low 3.x cSt, but for racing really prefer something more in the 3.5-up range...

Pretty sure.......

Reply #58 – February 23, 2016, 10:51:54 AM

Looking at the differences between the 5w50 and 15w50, I don't see any reason why the 5w50 wouldn't work for me.....

https://mobiloil.com/en/motor-oils/mobil-1/mobil-1

Looking at the AMSoil 5w50 I might just give that a shot. Shop up the road keeps it in stock.

http://www.amsoil.com/lit/databulletins/g2880.pdf

Phosphorus is 772 ppm and zinc is 842 ppm as per Bob is the oil guy. Half of a 4oz. bottle of ZDDPlus should do the trick.....

Pretty sure.......

Reply #59 – February 23, 2016, 11:48:48 AM

I still don't know why you guys are running such thick oil. My stock rebuild 302 is happy as a pig in slop with synthetic 10W30. No noises, knocking, or chattering and good oil pressure.