Synthetic vs Petroleum

**Cajunrider** · 07-29-2008, 09:00 PM

Just did my 4,000 mile change Saturday. Mobil 1 20w-50 for $8.58 per quart and SuperTech filter for $2.48 at WalMart. I spoke to the mechanic at the dealership who put my son's V900 together about blending 20w-50 and 10w-40 in the winter months. He told me that many he knows do this but the specific gravity of the 20w-50 is higher than the 10w-40 causing the heavier oil to settle at the bottom of the crankcase overnight. Working in the NGL industry with different component specific gravitys never brought this to my mind. I would have thought that the oils would have blended somewhere between 20/50 and 10/40 and remained there. He did say that shortly after the engine is started the oils are blended again??

07-29-2008, 09:00 PM	#29
Cajunrider Join Date: Apr 2008 Location: (SE Louisiana) Posts: 8,340	Synthetic vs Petroleum Just did my 4,000 mile change Saturday. Mobil 1 20w-50 for $8.58 per quart and SuperTech filter for $2.48 at WalMart. I spoke to the mechanic at the dealership who put my son's V900 together about blending 20w-50 and 10w-40 in the winter months. He told me that many he knows do this but the specific gravity of the 20w-50 is higher than the 10w-40 causing the heavier oil to settle at the bottom of the crankcase overnight. Working in the NGL industry with different component specific gravitys never brought this to my mind. I would have thought that the oils would have blended somewhere between 20/50 and 10/40 and remained there. He did say that shortly after the engine is started the oils are blended again?? __________________ 2016 Electra Glide Ultra Limited CVO Palladium Silver / Phantom Blue 110 cu in SE 2012 Electra Glide Ultra Limited (Traded 6/22/16) Tequila Sunrise / HD Orange Vance & Hines true dual headers Rinehart 4" slip ons Screamin Eagle Super Tuner Screamin Eagle Stage 1 intake Dyno tuned H.O.G.# 4514015 2007 Nomad 1600 (Traded 6/23/12) VBA #482
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