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DateQuestionAnswer
03/02/2009
Do Multi-Viscosity Oils Become Long Molecule Thicker Oils as They Heat Up?
Several of us car buffs at the Propulsion Lab have been arguing about what the numbers mean in multi-viscosity SAE designations. I said "The multi-viscosity oil molecules want to link together as they...
You are generally correct. Multi–viscosity oils contains polymers called viscosity modifiers and these polymers act to thicken an oil as it heats up in order to provide the high temperature viscosity ...
02/24/2009
Must 5W-20 be Used in HEMI MDS Engines?
Is 5W-20 still the choice grade for 5.7 HEMI MDS engines under extreme temperatures? The Owner's Manual and related TSBs all state that 5W-20 must be used whereas pre-MDS HEMIs were recommending 5W-30...
We recommend you follow the recommendation in your vehicle's owner's manual. If you are concerned about durability due to higher temperatures, then going to a higher viscosity grade would provide a be...
02/19/2009
Is Mobil 1 Less Likely to Produce Sludge than Valvoline Synthetic?
I used Mobil 1 in my '03 Intrepid 2.7L engine from 7.5k to 97K miles before I gave it to my son. I did this for known sludging problems in the Chrysler 2.7L. I told him he could only have it if he use...
The best evidence for him is your own experience and it sounds like you have had outstanding performance from Mobil 1™. So you might want to show him all the OEMs (original equipment manufacturers) th...
02/18/2009
Which Gear Oil Brand is Best for Porsches with Limited Slip Transaxles?
For Porsches with limited slip transaxles, I've heard that Mobil 1 Synthetic Gear Lube LS 75W-90 is too slippery for the synchros and that Mobil Delvac Synthetic Gear Oil 75W-90 is the preferred lube....
Mobil 1™ Synthetic Gear Lube LS is specifically designed for limited slip differentials. It contains a nominal amount of friction modifier to satisfy the needs of many applications. Mobil Delvac™ Synt...
02/15/2009
What Are the Benefits of Low Ash Oil?
What are the benefits of using "low ash" oil? I have some Mobil 1 low ash for my Mercedes diesel. Can it be used elsewhere?
Low ash oils typically are used for diesel vehicles that have a DPF (Diesel Particulate Filter) so the carryover oil that makes it into the exhaust system does not foul the particulate filter.  We rec...
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