BAD-L88

Hi,

What's the best motor oil for a performance motor? High compression? Low compression? Big block? Small block?

synthetic/non-synthetic?

Please name your brand and grade.

BSeery

In the Phoenix heat, and in my crappy low oil pressure haven 95,000 mile L-48, I run Mobil1 10w40.

I will run Mobil1 10w30 in the new motor after it is broken in. I will use either Regular Valvoline or Mobil (non-synthetic) until then.

Turbo-Jet

I just put in Valvoline 5W-30. (they have the coolest comercials...)

Budman68

Mobil 1 - 10W-40 also.

Tahos

Mobil I 10W30 after break in on rebuild.Castrol GTX 10W30 during break in.

MIKER

Hey, this looks like a good thread for a "POLL"!!!

Why not ask "What's the worst oil?" and "Why?"

I'm guessing that one major name brand dino-oil is pretty much as good as the next. Changeout frequency is more important than brand name.

Mobil 1 synthetic IS definetly a superior product (based on tolerances) but to what extent are the benefits actually utilized by the average driver?

Equally important is "Which oil filter is best?"

MotorHead

After I got mine rebuilt the engine builder said 20W50 after it was broken in. I tried that once
change the oil when it was a little cooler outside and the stuff would barely flow out of the
drain pan. It was like molsasis.

I think any name brand 10W40 is good enough.

villare

My vette only touches Mobil 1 and I use 10W30 after break in.

1LE

Can't go wrong with Mobil 1.

StrayDog

Moble 1 10/30 in my 1966 ,427 big/block & Moble 1 , 5/30 in my 01 c5....Works for me........

Alwyn678

Is there really a difference...maybe btw weights and syn vs nonsyn....but otherwise I usually buy what is on sale 10w-40 in winter and 20w50 in summer

GTR1999

Always use 10w-40 any major brand
Gary

Tom454

I use Valvoline 141 (10-40). Tried Mobil 1 only once. It was just as dirty and contaminated as dino oil after 3000 miles so I decided Mobil 1 was not cost effective for me. I couldn 't argue with the results. So I switched back to dino oil. The engine now has 220,000 miles on it. I change the oil every 3000 miles.

68shark

20W50 recommended by engine builder, Castrol GTX or Pennzoil. Use 10W30 for the soon upcoming storage season. Regular oils not synthetic.

70PurpleLS7

Pennzoil 20W/50 here...

71coupe

Valvoline 10w-30 or 20w-50 (switch according to outside temps). No synthetics.
Also, AC PF-35L filter.
If you are breaking in a new motor or cam, add GM Engine Oil Supplement
E. O. S., p/n 1052368.

Garys81

Castrol GTX 10w30 for fall and winter storage/nice day only drives. Over the summer I use the 10W40 by Castrol.

I always use the AC Delco PF35 (long) instead of the PF 25 filter. I change the oil and filter every 3000 or 6 months.

I have been reading up on the Amsoil products, anyone use this or have any comments on them? I also have given thought to switching to Wix or Hastings filters any comments ?

marky mark

Valvoline 10w-30 wt. non-synthetic. :chevy :flag

Wrencher

I use straight 30wt Valvoline. The temps never get cold enough to worry about the viscuosity, and under extreme conditions (high heat, loads or RPM), multi-grades can foam. Granted, my street car doesn't see these extremes much, so I could probably run most anything. In the race cars, we always ran Redline 50wt synthetic.

Hans

norvalwilhelm

Castrol GTX 10 w 30 all the time. My car sits alot and I read that synthetics are not good for cars that sit alot of the time. It runs off quicker. I also change my oil at least every 2-300 miles and run it through one of my other vehicles.