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Is there a viscosity rating on Mobil 1?
Walmart's prices on Mobile 1 are hard to beat. I've been running extended drains (15k each oil change) on several cars for years using their extended synthetic. I put about 65k on my Geo doing that and the little car runs great still with 180k on it and climbing. I recently switched it over to Amsoil to join the Amsoil extended drains I have been doing since about the year 2000 on most of my vehicles. I have 40k on my rebuilt Camaro 305. It's running Amsoil and I have NEVER changed the oil on it. I ran a short break in with Valvoline, then put the Amsoil in and havent EVER changed it. I check the oil level every few thousand miles, and every few years throw a new filter on just for the heck of it. I'm hoping it will just blow up so I can put in a 350, but I'm afraid it's just gonna run forever on that oil. Still runs exactly the same as day I rebuilt it and no sludge buildup. But for an affordable good oil or extended drain stuff you can easily buy local, you just can't beat the Mobil1 from Walmart.
Maybe i'm not understanding the question? i think synthetic is a "type" of oil not a thickness? Thus, synthetic comes in many viscocities. 5w-30, 10w-30, 10w-40 etc.