Ravenol is one of the few manufacturers that offers synthetic oils (not all, only those labeled "vollysint").
I have been using various Valvoline synthetic oils 10+ years in multiple stationary engines, tractors, diesel and petrol engines. No sludge, no varnish inside the engines, and never worn an engine out.
I use Valvoline restore and protect. It fixed the tick after a few oil changes
5W30 Valvoline Restore and Protect is good
Valvoline Restore & Protect is reportedly great.
Olio sempre e solo Ravenol (mi sono studiato le tds di una marea di olii e questo \u00e8 il migliore, lo acquisto sul loro sito tedesco)
I run Valvoline restore & protect because 2x 5 qt jugs fits my 4 qt Prius and 6 qt Maverick perfectly and I run it on the Prius which has stopped oil burning from the low tension rings.
I can recommend Ravenol 5W-40 NDT oil, it's basically the best oil for the N57 (I assume also for the N47)
I went to Valvoline once, oil pan emptied itself onto their floors the moment I started the engine. Joking aside I think it's perfectly fine to go to Valvoline, I go there often bringing my own oil and filter, that way I know it's the right oil and it's good quality stuff.
Ravwnol e cea mai mare mizerie.
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