12345349 bottle says its "partially synthetic", bottle of Valvoline 811095 says synthetic, will replace both 12345349 & 12346190, NOT! I think the Valvoline would work in a NVG 3500 but not a 4500 as it has non-brass syncros.
BC 1960 Chevy C10 driver 261 T5 4.10 dana 44 power loc 1949 GMC 250 project in waiting 1960 C60 pasture art Retired GM dealer tech. 1980 - 2022
