Which oil should I use ?

[ungrave]

The Synthetic Diesel Oil does in fact have the additional additives. And a much better viscosity range for a stock car compared to the 15w-50. Here's a comparison of some of the options. I don't see any reason to rule out the synthetic diesel as an option for a stock turbo Buick. If you're still concerned about ZDDP level, give Kriban $10 per oil change.

Mobil 1 10w-30 has 800 ppm Phosphorus (ZDDP)

Mobil 1 TDT 5w-40 has 1100 ppm Phosphorus (ZDDP)

Mobil 1 15w-50 has 1200 ppm Phosphorus (ZDDP)

Mobil 1 Racing 0w-30 has 1750 ppm Phosphorus (ZDDP), but is not recommended for street use (no detergents, I believe).

Brad Penn has 1400 ppm Phosphorus (ZDDP), but is not a Synthetic Oil.


Mobil 1 Oil Chart

Modern DOHC 4 & 6 cyl. cars as mentioned more then likely have roller cams and do not need the additional addatives...wieght grades for different operating temps & turbos are a different issue. If you are running a roller cam pick your favorite oil, change regularly and be done with it. We are talking hi-performance motors with flat tappet cams where the current conventional & synthetic oils are a problem do to reduced ZDDP content. This is done to extend the life of catalytic converters but is a big problem with wiped cam shafts from reduced ZDDP. In this case run what you like and add ZDDP or run a Racing oil and no addative...pick a weight that fits your operating temp and again be done with it.

Diesel oils are going clean so the once high ZDDP diesel oils out there are also going away and no longer provide the needed ZDDP for a hi-performance flat tappet cammed motor.

 

[groumoutis]

TimBuick,

Your car doesn't leak? You might want to check your fluids you may be out! LOL

 

[Dennis Kirban]

TimBuick,

Your car doesn't leak? You might want to check your fluids you may be out! LOL

Isn't that the truth! One reason most turbo owners don't have concrete driveways as they would show too many oil spots!

denniskirban@yahoo.com

 

[LOT]

??????

TimBuick,

Your car doesn't leak? You might want to check your fluids you may be out! LOL

Why do people assume it is OK for them to leak. Mine don't leak. Assuming the seals and gaskets are installed properly--did you ever stop to think why they leak? I agree they are prone to leak. IMO if every TR had Deniss's positive stop there would be a lot less leakage.

 

[A2000RICH]

The Synthetic Diesel Oil does in fact have the additional additives. And a much better viscosity range for a stock car compared to the 15w-50. Here's a comparison of some of the options. I don't see any reason to rule out the synthetic diesel as an option for a stock turbo Buick. If you're still concerned about ZDDP level, give Kriban $10 per oil change.

Mobil 1 10w-30 has 800 ppm Phosphorus (ZDDP)

Mobil 1 TDT 5w-40 has 1100 ppm Phosphorus (ZDDP)

Mobil 1 15w-50 has 1200 ppm Phosphorus (ZDDP)

Mobil 1 Racing 0w-30 has 1750 ppm Phosphorus (ZDDP), but is not recommended for street use (no detergents, I believe).

Brad Penn has 1400 ppm Phosphorus (ZDDP), but is not a Synthetic Oil.


Mobil 1 Oil Chart

to anyone that really understood oil specifications the only oil that would ever be considered for a GN from that list (assuming the numbers are actually correct) would be the 0w-30 mobil 1 since it has 1750 PPM of zddp------but only if it were going to be used under actual racing conditions------ ie race for a day or weekend and drain the oil since it is low on detergents and other things that are necessary for street engines where the oil remains for long periods of time---------numerous industry tests and engineering studies performed by the car companies and the SAE show that maximum protection against sliding metal to metal wear in non pressurized locations of an engine are provided by 1800-2000 ppm of zddp-------thats why thats the level in the best racing only oils such as "off road" vavoline and a few other top notch racing oils-------ANY oil that is labeled SM is totally inedaquate for these cars and time will prove it to the owners that are living in the past and using oils that they have trusted for decades--------rotella was a ok but not perfect choice a few years ago but the formula has changed three times since 2004--------its now a very poor choice--------simple fact is they are reformulated and statements like "high levels of zddp apply to the levels adequate for modern cars that have been designed for lower levels to begin with-------its a play on words and not engineering facts---------brad penn might be a good oil ( good but not generous levels of zddp) but they don't even care enough about it to have it API certified--------i seriously doubt it could pass the SM test sequence------at least i have not seen where it was------i stand corrected if i am wrong-------fact is really simple---------except for one category of performance modern API SM oil is the best formulation that has ever been offered-------it is the only oil grade that can pass new car certifications for warranty-------but those cars have been designed to survive without large doses of zddp--------but modern cars do put oil to higher stress levels than ever-------oil from 20 years ago would result in quick failure of modern engines and not just due to emissions requirements------the simple addition of this one additive to API SM rated oil makes it the best performing oil that has ever been available to older car owners---------there is just so much misunderstanding of the technical facts-------one poster stated they use 1/4 bottle of EOS or a bottle of zddp (i will assume it is ZddPlus) --------imagine that--------ZddPlus is a 4 oz bottle and EOS is 16 oz-------fact is one four oz bottle of ZddPlus has the same concentration of zddp as two bottles of EOS---------He appears to have it backwards--------two oz of ZddPlus is equal to a 16oz bottle of EOS--------a quarter bottle of EOS would equate to about a tablespoon of ZddPlus---------------there has been a lot of mention of synthetic oils------a few facts about synthetic--------about 8 out of ten oils labeled synthetic are in fact group three petroleum based oils-------yes!!!! even the so called synthetics from some of the biggest and most respected brands-------real synthetic is group 4 PAO like mobil 1 and Amzoil--------its a fact-------do research on it and you will find it to be true--------the non engineering types at the national advertising council made a ruling on this over a decade ago and they decided that it would be legal to advertize high performance non synthetic oils as synthetic---------tribology is a fascinating subject and i have discovered a lot about the truth about motor oils and marketing but nothing is more fascinating than some of the opinions held by car owners................RC