SteveB(OH)
Member
Hello All,
From time to time I have an OT question and in the past you have been very helpful, I have another question for you all.
I recently purchased a 2008 GMC Envoy with 160,000 miles to tow my 3,000 boat and run errands in (it's not my daily driver). We call it our "farm truck".
I decided to change fluids, including the front and rear differential. GM spec's 75W90 for both the front and rear diff.
I happened to have some Valvoline fully synthetic 75W140 laying around so I used that instead for both front and rear. Some of my friends have warned me that I am inviting disaster and that I need to immediately drain the 75W140 and refill with 75W90.
I didn't think it would be a big deal, but now they have put doubt in my mind.
I know that some of you are well versed in oils, can you enlighten me about this ?
Thanks !!
From time to time I have an OT question and in the past you have been very helpful, I have another question for you all.
I recently purchased a 2008 GMC Envoy with 160,000 miles to tow my 3,000 boat and run errands in (it's not my daily driver). We call it our "farm truck".
I decided to change fluids, including the front and rear differential. GM spec's 75W90 for both the front and rear diff.
I happened to have some Valvoline fully synthetic 75W140 laying around so I used that instead for both front and rear. Some of my friends have warned me that I am inviting disaster and that I need to immediately drain the 75W140 and refill with 75W90.
I didn't think it would be a big deal, but now they have put doubt in my mind.
I know that some of you are well versed in oils, can you enlighten me about this ?
Thanks !!