I use Valvoline R&P 0w-20 and my engine sounds healthy. so does my mom’s Velar. I think whats more important is using the correct viscosity and changing it on time.
Valvoline restore and protect oil or shell rotella t6 oil....
The t6 diesel oil has all the detergents you need to maybe clean out the rings. (And meet the more stringent european standards).
I have a baleno woth 130k mileage and I have been using shell 10w 40 and the performance and fuel avg is great
I use rotella 15w-40, high zinc content but my engine also has 230k miles
5-30 Valvoline restore & protect is working wonders on my 2.5. Visibly cleaning out deposits and engine running stronger
I use one oil - shell rotella. It goes in my XRL my 4.0 Jeep and my 7.3IDI diesel ????
I always used gn4 but switched to rotella t6 15w40 cheaper, full synthetic. it can handle the heat alittle better and I like the shift quality over gn4. Walmart has it for cheap
I switched to valvoline restore and protect on my 06 is250 and it’s working great. The valves are a lot quieter compared to the previous oil I was using which was Kirkland synthetic.
Shell Rotella (Rimula) 10W40, mines on 165k, 6 months ago I did the O2 Pilot mod and started to use the above oil as it's fully synthetic and made for Buses, Heavy Trucks etc, and so has extremely good cleaning abilities. My oil consumption has dropped almost 4 fold and the cams, rockers, oil filter housing have all been cleaned of the varnish type coating they had too.
I have run the 5w-40 and stuff every day here in utah and it works fine on 300-400 bhp setups. If you are going to the strip or the dyno and going for probably 450-500 crank I would probably grab that gold top mobil one 15w-50. I would also use that for any road racing where the engine oil gets really thinned out from heat. It's also cheap at wal mart I believe. Over at 575-600 bhp we lost a main bearing when doing endurance testing on valve springs with the 5w-40 and very reasonable oil temps. It didn't really catastrophically fail, but was on it's way to it when we tore it down. Have since switched to VR1 20w-50, and the problem so far appears to be cured. That stuff will carry way more load then the thinner oils- the catch is that it's absolute sludge until warmed up. Yet another one of the barriers to extreme power "street" cars I suppose. I'm keeping an eye on it to see if we have a solution. If that doesn't fix it, the problem may be aeration of the oil- we were running at 7500+ for pretty long periods. So basically now the oiling system is a major focus of R&D for us. The oil pressure was never out of the ordinary- although it does start falling once past about 7500 rpms which is also not great.
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