oil change
Thread Starter
Pro
Joined: Jan 2007
Posts: 561
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From: Bethesda Maryland
oil change
Its about that time for an oil change as my readout is at 9%. Obviously puttting in Mobil 1, but not sure which # to go with. My vette has 41k on it and I know the numbers on oils have something to do with mileage. So what do I get? 10w30? ect... thanks
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Joined: Jul 2004
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From: Lake Havasu City, AZ
the numbers have nothing to do with mileage.
A synthetic motor oil meeting GM4718M is required.
5W30 is the preferred viscosity or weight.
10W30 can be substituted if the lowest temperature your car will experience between oil changes is above freezing.
with 02blackbeauty19 stick with
5W30. there is no reason to go to 10W30
A synthetic motor oil meeting GM4718M is required.
5W30 is the preferred viscosity or weight.
10W30 can be substituted if the lowest temperature your car will experience between oil changes is above freezing.
with 02blackbeauty19 stick with 5W30. there is no reason to go to 10W30
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5W30 would be fine in the car. 
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I spoke to a Mobile 1 technical guy, a short while ago and he told me that essentially, 10W-30 in synthetic oils is obsolete. It provides no benefit over 5W-30 and the 10W-30 takes longer to circulate through the engine at startup temps - even at 70 degrees F.
This particular guy lives in Texas and was using 0W-40 Mobil 1 in his vehicle. For most of us C5 people, 5W-30 is the best choice when using Mobil 1.
This particular guy lives in Texas and was using 0W-40 Mobil 1 in his vehicle. For most of us C5 people, 5W-30 is the best choice when using Mobil 1.