Everyone's Favorite Subject (Oil)

[LowR3V'in]

^so what are you using?

[digger]

despite what the 25yr old manual says i would never use 20W-xx ever on an engine that sees lots of cold starts, the oil pressure when cold would be through the roof which typically means you are getting less flow on a cold engine. and you know what they say about when most wear happens.....in any case any differences between oils will take a loooong long time to show up so using an oil for a few years without issues means basically nothing, except perhaps pertaining to cam lobe wear but that's not a viscosity thing.

an oil temp and pressure gauge will go along way to tell you what is good for your application

i also am a fan of penrite

[LowR3V'in]

20w50

BUT!!

recently I discovered that is way to thick for cold starts
so probably a 5w40 is more acceptable.
Just have to get an oil pressure gauge and test it out.

[mitchlikesbikes]

i ran 15-50 mobil1 from wally world and beat the living piss out of my car for a summer with no issues. probably going to do the same again this coming year.

[3vilE30]

I will tell you one thing though. If that LiquiMoly goes on sale again a BA I may buy a couple gallons of it. I have heard a lot of good things about it.

LiquiMoly is some good stuff, look for their mos2 anti friction blends. Probably the only oil I would run if I had a built m20.

[Bullhead]

I will tell you one thing though. If that LiquiMoly goes on sale again a BA I may buy a couple gallons of it. I have heard a lot of good things about it.

[lukeADE335i]

Penrite HPR10 - full synthetic 10W50.

Cheap down here as it's Australian oil - good product.

[mr.vang]

I don't know about you guys but when using 20w50, it takes longer to start to car and sound bad during start up. Switching to 10w40 solved all the problems listed.

[SkiFree]

Here are four separate threads on the same subject for you.....

http://www.r3vlimited.com/board/showthread.php?t=111540

http://www.r3vlimited.com/board/showthread.php?t=229204

http://www.r3vlimited.com/board/showthread.php?t=110886

http://www.r3vlimited.com/board/showthread.php?t=182963

[4x4_e30]

http://www.amsoil.com/shop/by-produc...?code=ZRFQT-EA

AMSOIL Z-ROD™ Synthetic Motor Oil is specially engineered for classic and high-performance vehicles. It features a high-zinc formulation to prevent wear on flat-tappet camshafts and other critical engine components, along with a proprietary blend of rust and corrosion inhibitors for added protection during long-term storage. Z-ROD Synthetic Motor Oil is designed to perform on the street and protect during storage.

AMSOIL, the leader in automotive synthetic lubrication, produced the world’s first API-qualified synthetic motor oil in 1972. Trust the extensive experience of AMSOIL, the First in Synthetics®, to do the best job protecting your engine.

Protects Flat-Tappet Cams
The lifters and cam lobes on flat-tappet camshafts common to classic and high performance vehicles slide rapidly against one another, producing high friction and heat. The friction between the two components can eventually wear down the cam and affect valve operation, ultimately resulting in lost engine power and reduced efficiency. In addition, these areas are splash-lubricated rather than pressure lubricated like other areas of the engine, which adds extra strain on anti-wear additives like the zinc and phosphorus in zinc dialkyldithiophosphate (ZDDP).

AMSOIL Z-ROD Synthetic Motor Oil is formulated with high levels of ZDDP to protect flat-tappet cams, lifters, rockers and other areas susceptible to wear. Its high-zinc, high-phosphorus formulation provides the extra wear protection these critical splash-lubricated components require.

I'm not a millionaire, so I personally run Valvoline VR1.

[SlamedIAm]

15w40 Rotella here.

[101]

Another vote for 15W40 Rotella or Delvac in all my M20 engines.

[Bullhead]

15w40 Rotella here as well, ran it in my diesel trucks for years. One truck was making 600+hp at the wheels and all it ever had was Rotella.

[abit]

I use MOTUL 10W40 for street and lil bit sport :D but oil choice really depends from many factors, climatic conditions, race or street usage etc....

[lcoleman]

I like Rotella 15w40 dino for a daily-driven m20, and Mobil1 15w50 for a raced or boosted m20.