Castrol oil to Gen I?

[tnummenpaa]

I have understood that most ppl use Mobil 1 in the Viper. What's the recommended viscosity?

Has anyone used Castrol racing oil (Castrol TWS Motorsport 10W-60)? I'm using it in my BMW M5 and turbo charged ford sierra cosworth. I'm actually thinking of using it also in my '94 Viper.

Thanks!

 

[V10SpeedLuvr]

Mobil 1 10w30 full synthetic is factory fill for Gen 1 and 2's. Thats what I use in mine

 

[Copernicus]

I'm not sure what the benefits of using a 60w oil would be. I'm guessing your gas mileage would worsen as well as your horsepower.

 

[mad0953]

I use Mobil 1 0-40. Easier on motor here in So. Oregon where it gets below freezing and better protection when hot. Actually use it in all of my vehicles.

 

[Cobraken]

Mobil 1 0-40 synthetic is the recommended oil for my SRT 10 Ram

 

[Tom F&L GoR]

Funny that perception of high viscosity stays. F1 engines (760-790 hp) use 0W-20 or lighter. NASCAR (850-930 hp) uses 0W-30 for open engines, 0W-20 for plate racing, and lighter for qualifying. CART (when they were allowed) used 0W-20 in the 800 hp XFE, and still use a 5W-30 in the same-engine-for-everyone CCWS. IRL (aka Honda) allows only 0W-40, but then they don't have a series oil sponsor and want the engines to last since they are leased. I don't see that beyond a xW-40 there is any reason, need, or benefit. Unless it's free.

 

[sdaddy]

I had a relative who determined engine lubricant specs for a living tell me to never use a heavier weight oil than recommended. He claimed it would cause engine wear until the heavier oil flowed at the same rate as the recommended viscosity.

 

[Cobraken]

It was my understanding that Dodge is recommending the 0-40 for most new vehicles per owner manuals. My Saleen Cobra & Honda recommend 5-20. My Jaguar & Lexus 5-30. My Viper & Harley 10-30. Go figure.

 

[Steve-Indy]

For the record, I believe that you will find Mobil 1 10W-30 became the Viper's "factory fill" starting with the 1996 GTS (first Gen II)...noting that our 1996 RT/10 (though some loosely call this Viper a Gen 1.5...most of it is Gen I...including the engine)had standard mineral oil as the "factory fill".

As a matter of personal preference, some owners replaced their original oil caps with the "new" (second half of 1996)Gen II cap that was specifically labled with the Mobil 1 info...and, converted their Gen I Vipers to Mobil 1 10W-30. I did the same thing to our Gen I's, while retaining the original Gen I oil caps in my parts locker.

 

[Randy]

And then, there are many of us that use 15W50 Mobil-1 year round, though most of us that do live in the warmer areas and the cars see some amount of track as well as rush-hour commute use.

 

[tnummenpaa]

Thanks for comments.

The mentioned castrol (60w)is the only approved oil for M5. And in the turbo charged cosworth that's proven to be the best oil recommended by most the enthusiatst. I think the reason is that cosworth turbo is oil cooled and thus the oil gets very hot. I'm sure Viper is not running that hot in any circumstances.

I go with the growd and put in Mobil 1 10-30 or 10-40.

 

[grcforce327]

I switched to Rotella synthetic 5w-40!

 

[99 R/T 10]

I switched to Rotella synthetic 5w-40!

I would think this is the best of both worlds, right Tom?

 

[Tom F&L GoR]

Very much so.

Good low temperature properties, very satisfactory high temperature viscosity, significant additive package, and excellent base oil. Best of 4 worlds.

 

[Joseph Dell]

Since we are talking oils, what's the best oil to use when an offset ground crank has been applied? I've been told a 50 weight of some sort, but does that mean 20w50 or 15w50, or 0-50?

when i ran 10-30 w/ the offset ground crank, oil pressure was a tad low... i'm guessing the bearing tolerances are different when running chevy bearings (what most of the stroker cranks do).

plus i'm a turbo motor, so things get hot.

should we play the trivia game 'what oil should JD run'?? b/c JD is clueless.

Thanks!

JD

 

[Tom F&L GoR]

At 100C, all those oils will have the same viscosity; between 16.3 cSt and 21.9 cSt.

Diesels in the US are mostly turbo 10L to 13L engines running at max torque 50% of their life. Hot. They almost universally use a 15W-40, although some now have a 10W-30 as factory fill. It's the additives that matter.

The synthetic diesel I believe only comes in a 5W-40 grade and is at Walmart. I'd try that. If it seems inadequate (not sure how you'll measure this) then you might want an oil cooler. If you believe it's getting too "hot" a thicker oil might provide a thicker oil film, but the high temperatures will affect it just like a lower viscosity oil. You'll end up with thick dark gooey oil instead of thin dark gooey oil.