KALAWAY

Just curious about what type (Castrol, Penzoil, etc) and grade (10W40, 5W-30, etc) motor oil you use in your Vette. Mine is a '75 w/97K miles.

marshrat99

You can expect to get a lot of varied replies on this question. I use Mobil 1 10W30 in my 79.

Motor City Vette

I've been using Valvoline Max Life 10W30 (not the synthetic formula) for quite a while and have been very happy with it.

joe73vette

Since I don't drive my vette in real cold weather, straight SAE30 works for me. I get about 5psi more pressure than with 10W30. Also I change it often, so cheap NAPA oil and the best NAPA filter is what I buy. Joe
PS single weight oil has less additives than multi-weight, so I think it is better.

C3 Stroker

I use Royal Purple 10w40 synthetic..... dyno tests have shown around 5 more hp & every little bit helps ET.

Stoge

Valvoline since its first oil change in 1980. Using 10w 40 currently.

stingr69

15W-30 or 15W-40 Diesel oil service class CI-4

-Mark.

Carl Granquist

Chevron 10/30 for my '71 L-48 (no hi-perf mods).

Jughead

Quaker State 10W-30 still breaking engine in. May switch to synthetic next oil change (next year).

MN-Brent

I use Valvoline Durablend 10W30 in all my vehicles.

Keeps rocker noise low. I tried Quaker State once (on sale) and noticed an increase in rocker noise in my 4.3L Blazer-switched back to Valvoline and the noise disappeared.

Brent...

comp

Glassbowtie77

Valvoline Max Life 10w30.

Tom73

I use Mobil 1 10W30 synth in my '73 LS4, also in the C5 but 5w30, in the turck, and even in the mower (only oil on the shelf when spring mower service took place )

tom...

codestar7

Started with Castrol in 1976 and still use it when I can, have even torn down engines that ran exclusivly on castrol and they were still clean at 40,000. Good stuff.

pgtr

Ditto!

DRKCYDE

10w30 Mobil 1

carl a

castrol 20w 50 summer/ 10w30 winter- change it 2,000 miles in summer-winter just for startups-then dump in wamer weather