Newb here looking for oil rec from the experts

[_M_]

hey everyone, first post. i have a question that stems from another discussion on another forum.

but i will ask the experts here on an oil recommendation for my car.

i have a 2005 mustang gt with a 300ci stroker, kenne bell superchager running 11 pounds of boost, and otherwise completely built. factory oil is 5w20. There is some discussion that a 5w30 would be a better choice for a car with forced induction such as mine.

i picked up some M1 yesterday as autozone was having a sale, but i got 5w20. i can use that in my truck, 5.7 hemi if not my car.

so what say the experts on this topic?

thanks in advance

 

[buster]

You could potentially run many oils and do ok. I would start with a solid synthetic 20wt, run a few oil analysis samples and go from there.

You might need to step up a grade if fuel dilution is a problem.

 

[_M_]

would M1 qualify as a solid 20wt?

 

[Steve S]

Solid oils do not work very good, Talk about cold start wear!!

 

[buster]

Originally Posted By: _M_
would M1 qualify as a solid 20wt?


Yeah I think so.

 

[_M_]

Originally Posted By: Steve S
Solid oils do not work very good, Talk about cold start wear!!


ouch

 

[glennc]

You'd probably be fine with a lighter grade but if it were my engine I'd start with at least a 5w30, more likely a 10w30 or possibly even a 10W-40. If you are building up higher combustion pressures than stock at low- to mid-rpm due to forced induction, bearing pressures will be that much higher than the manufacturer based the spec on. Heavy valve springs, if you have them, will increase valvetrain forces. And a stroker crank will have higher reciprocating forces at any given rpm.

My choice of brand would be Red Line. This is the exact type of application Red Line is made for.

 

[Drivebelt]

I agree with glennc. I would use at least a 30 weight.

5W-20 is really recommended (over the heavier oils) to meet CAFÉ (corporate average fuel economy). The manufacturers would send their cars to EPA for testing with the thinner oils to gain a little fuel economy on the testing cycle. The EPA said, if you do that then you have to clearly recommend 5W-20 in the manuals.

While modern 5W-20's has shown to provide good protection in "normal" engines and circumstances (modern base oils and add pac's are very good), I think they are running a little on the thin side for many types of performance situations where higher oil temperatures and stress's might be encountered. 5W-20 might do the job, but I would certainly feel more comfortable with more viscosity protection. I mean, why push the viscosity protection closer to the edge when you don't really need to, and it's just the manufacturer trying to gain a little fuel economy. I would give up the small fuel economy gains for a little extra viscosity protection, as a small gain in fuel economy isn't really your priority here.

 

[_M_]

thanks GlennC and Drivebelt...excellent answers

i did pick up an additional case of M1 5w30 today as auto zone is still having a sale...$26.98 for 5 quarts and a M1 filter.

i will look into redline for the next oil change

 

[bruce381]

in would use a XX/30wt IMHO a 20 is to thin

 

[pickled]

Amsoil ACD, or another tough as nails XW30.