What Oils are still Dexos1 approved? Chevrolet, 4.8L
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CF Junior Member
Joined: Oct 2015
Posts: 45
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From: South East USA
What Oils are still Dexos1 approved? Chevrolet, 4.8L
Wondering if I should go with a Blend...or full synth. Then I see ONLY FULL SYTH brandss are DEXOS1 approved currently The engine is 14 years old with 55k, I just became the owner this week so trying to do the right thing...I know full synth is suppose to be better but I worry about creating leaks if the previous owners used the Blends...ANy thoughts??
TY JT
TY JT
Last edited by JAMBUS; Nov 22, 2025 at 8:31 AM.
CF Addict
Joined: Jul 2014
Posts: 2,330
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From: Marysville, WA
I believe the full synthetic leak story has been debunked. I have run fulls in my 85 200SX and 93 Suburban, both over 350k miles. Your 55k motor is just getting broken in!! Pick your favorite brand and follow maunufacturers directions on weight.
So many more Dexos1 Options when using Full Syn.
CF Active Member
Joined: Jun 2022
Posts: 190
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From: Pensacola FL
I have no fear of full synthetic oil. I've never seen anything proven on the issue of leaks. When synthetic oil first came out there were a lot of myths circulating about but none of them seem to have played out.
Earlier this year I did a deep dive into Valvoline Restore and Protect and was very impressed with what I found with it's cleaning properties. I've always been a Mobile1 guy but used the Valvoline RP a few months ago. I just drained it after 3,000 miles (early for me) and the oil was darker than I expected and had a brown varnish color to it. I know it's not scientific but it does seem to be cleaning up the varnish deposits as claimed.
I'm going to keep with the 3,000 mile intervals until it starts coming out cleaner. I kept a sample so I can compare them in another 3,000.
My van has a lot of miles but seems very tight. I don't lose any oil at all between changes. I check it regularly but never have to add. I don't think it's darkening the oil with blow by or contamination.
Earlier this year I did a deep dive into Valvoline Restore and Protect and was very impressed with what I found with it's cleaning properties. I've always been a Mobile1 guy but used the Valvoline RP a few months ago. I just drained it after 3,000 miles (early for me) and the oil was darker than I expected and had a brown varnish color to it. I know it's not scientific but it does seem to be cleaning up the varnish deposits as claimed.
I'm going to keep with the 3,000 mile intervals until it starts coming out cleaner. I kept a sample so I can compare them in another 3,000.
My van has a lot of miles but seems very tight. I don't lose any oil at all between changes. I check it regularly but never have to add. I don't think it's darkening the oil with blow by or contamination.
Thread Starter
CF Junior Member
Joined: Oct 2015
Posts: 45
Likes: 3
From: South East USA
I have no fear of full synthetic oil. I've never seen anything proven on the issue of leaks. When synthetic oil first came out there were a lot of myths circulating about but none of them seem to have played out.
Earlier this year I did a deep dive into Valvoline Restore and Protect and was very impressed with what I found with it's cleaning properties. I've always been a Mobile1 guy but used the Valvoline RP a few months ago. I just drained it after 3,000 miles (early for me) and the oil was darker than I expected and had a brown varnish color to it. I know it's not scientific but it does seem to be cleaning up the varnish deposits as claimed.
I'm going to keep with the 3,000 mile intervals until it starts coming out cleaner. I kept a sample so I can compare them in another 3,000.
My van has a lot of miles but seems very tight. I don't lose any oil at all between changes. I check it regularly but never have to add. I don't think it's darkening the oil with blow by or contamination.
Earlier this year I did a deep dive into Valvoline Restore and Protect and was very impressed with what I found with it's cleaning properties. I've always been a Mobile1 guy but used the Valvoline RP a few months ago. I just drained it after 3,000 miles (early for me) and the oil was darker than I expected and had a brown varnish color to it. I know it's not scientific but it does seem to be cleaning up the varnish deposits as claimed.
I'm going to keep with the 3,000 mile intervals until it starts coming out cleaner. I kept a sample so I can compare them in another 3,000.
My van has a lot of miles but seems very tight. I don't lose any oil at all between changes. I check it regularly but never have to add. I don't think it's darkening the oil with blow by or contamination.
JT
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