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I wouldn't try to go any thinner than that 5w-20 oil.
There was a Cummins diesel report that I read showing they only charted a 3% fuel economy difference between 15w-40 and 5w-20 oils.
And they found the 5w-20 oiled engines had much higher wear rates in the valve train.
Doesn't seem worth it to run thinner oil. The only 0w-20 oil I know of is amsoil and their oil is 3 to 4 times the price of department store 5w-20 oil.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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