I run 10w60 liquimoly gt1 full synthetic. Engine build 2019 till now no issues regular oil changes
Fixed many ls engines with excessive oil burning by switching them to t4 rotella 15w-40. The rotella t4 flavor of it is a fantastic oil. If you're engine has good oil pressure and isnt burning oil then theres probably no need to for it but its not gonna hurt a thing. Gen 3 ls engines arent some super tight tolerance engine, i probably wouldn't put 15-40 in a motor that calls for 0-20 but your 5.3 will not care at all.
He may be using it for the 15w40 weight for noise or lower oil pressure. I ran Rotella in my 94 F150 with the 5.8l gas engine because I bought it with a slight knock. After a while I dropped down to the 10w30 Rotella and ran it for year, lifted mud truck driven daily and in the woods on weekends. It will be fine, just get some clarification on why. I currently run Rotella 10w30 in my 4.2l Envoy.
Pick one oil and run it for life preferably liqui moly , I hear these particular engines need one oil for life , drive her hard sometimes should be fine
I run 5w30 liquimoly molygen since i tow a lot on my 2019 5.3
Oil pressures are happy and so far so good.
I always used LM 5w40 in my m62tu
Never had any issues and seemed to be a high quality brand
I ended up going for Liqui moly leichtlauf 5W40 and in the 300km gone nothing has been consumed which is good news.
ich in meinem Astra J 1.6 Turbo (A16LET) nur das Öl fahre, was Liqui Moly empfielt. Läuft bisher gut.
Inoltre io con olio liqui moli ho notato un consumo d'olio più alto e sono passato a motul e si è dimezzato, ma io ho 270k km.
Moved to LM and my car burns 1L every 1500miles or so. Also was having a weird shudder for few seconds about 15seconds after cold start
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