Hi everyone, salam. My Opel Astra H 1.4's service is due. I'm going to get it serviced, and I bought Liqui Moly Top Tec 4600 oil, and along with it I got an engine flush because I don't know what oil was used at the previous service, and I don't want the old oil mixing with the new one — if it was a low-quality oil, I don't want it ruining the new one's properties. The car is at 148k km and no engine flush type additive has ever been used before. When I researched it online I saw negative opinions saying if it hasn't been used before don't start now, it can damage older engines, and that a flush is pointless without using a running-in oil afterward, but on the other hand some people said it's healthy for the engine — the old oil gets fully filtered out, it cleans deposits and grime, and the engine runs better and quieter. I got really confused about whether to use it or not — will it cause harm or not? I'd appreciate it if anyone who knows about it or has used it before could help.
Translated from TurkishReplies
1 repliesIf you do a flush it's much healthier, but if that's not possible, using it correctly won't cause any harm - on the contrary it'll help. Read the specification and apply it. If you bring your next oil change a bit earlier, you'll both feel at ease about whether it affected the properties of the new oil, and the engine will keep running in a healthier condition.
Translated from Turkish