Swtiching to synthetics

[Instrument 39]

If I switch and I start leaking , say at the rear main seal. will my warranty cover it? Have 24K on the truck.

[nhkid28]

This is what Mobil 1 says:

 

Myth-Mobil 1 will leak out of the seals of older cars.

 

Mobil 1 does not cause leaks. In fact, new Mobil 1 with SuperSyn™ was tested in dozens of industry standard and OEM tests to prove its seal performance. It is fully compatible with the elastomeric materials from which all automotive seals and gaskets are made.

ExxonMobil engineers are wary of conventional oils that tout their use of additional seal-swelling agents. With extended use, these agents can over-soften engine seals, resulting in leaks. More to the point, an oil additive will not rejuvenate worn or damaged seals. The damaged seal may have been caused by a worn rotating metal component in the engine.

If an older engine is in good condition and does not have oil leaks, Mobil 1 with SuperSyn™ provides the same advantages as when used in a new engine. ExxonMobil recommends taking measures to repair the leaks, then using Mobil 1 with SuperSyn™. ExxonMobil also always recommends following the automobile manufacturer's manual for the proper oil to use.

 

Myth-Using Mobil 1 will void my new-car warranty.

 

With the exception of the Mazda rotary engine (Mazda does not recommend any synthetic motor oils), Mobil 1 with SuperSyn™ will not void new-car warranties. Mobil 1 with SuperSyn™ exceeds the API and ILSAC motor oil service requirements of all new-car manufacturers, both import and domestic. If in doubt, always check your vehicle owner's manual or contact your vehicle's manufacturer.

 

Hope this helps!!

[TxDoc]

Here's a thread from a week or two ago on the same subject.  If you go to most manufacturer's websites, you will find a great deal of info and answers to FAQs.

 

click here