5/40 is the recommended multigrade for my Volvo diesel, but because I have to do a lot of stop start driving in winter I would like to use an 0/40 oil (Same price as a fully synthetic 5/40) for the slight improvement it provides in initial cold start wear protection terms.
I use Liqui Moly Synthoil and wrote to them asking why I should not use an 0/40 oil, but all they said was it was untested in my engine type. Volvo also say not to use 0/40 without saying why not and even some modern cars have 5/20 or 5/30 recommended and a warning not to use any zero rated oils.
Anyone know why???
I use Liqui Moly Synthoil and wrote to them asking why I should not use an 0/40 oil, but all they said was it was untested in my engine type. Volvo also say not to use 0/40 without saying why not and even some modern cars have 5/20 or 5/30 recommended and a warning not to use any zero rated oils.
Anyone know why???