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68Gold/white · 08-31-2017, 10:10 AM

How many miles???
Any of the name brand synthetics are fine to use. Even the house brand at Wal Mart, HoReilly's and NAPA are usually bottles by Ashland, the company that makes Valvoline. Use a NAPA or Wix filter.

You need to find out if the rear end is a posi, if so, do NOT use synthetic it it. If it is a posi use a name brand 80w90 in it with the GM posi additive,

If you don't have too many miles I would not worry about the rear end, yet. Just check it to make sure it's full!!!

08-31-2017, 10:10 AM	#4
68Gold/white Registered User Join Date: Sep 2011 Location: Ark City, Kansas Posts: 3,272	Re: 2015 Silverado LTZ How many miles??? Any of the name brand synthetics are fine to use. Even the house brand at Wal Mart, HoReilly's and NAPA are usually bottles by Ashland, the company that makes Valvoline. Use a NAPA or Wix filter. You need to find out if the rear end is a posi, if so, do NOT use synthetic it it. If it is a posi use a name brand 80w90 in it with the GM posi additive, If you don't have too many miles I would not worry about the rear end, yet. Just check it to make sure it's full!!!