KELLY88
New Member
- Joined
- Feb 26, 2008
- Messages
- 2,371
- Reaction score
- 4
- Points
- 0
- Location
- Lake Mary/Daytona Beach, FL
- Vehicle Year
- 1997, 2005
- Make / Model
- Ford
- Engine Size
- 4.0, 4.0
- Transmission
- Automatic
Does it matter if you mix different types of motor oil? My brother's Cadillac developed a small oil leak, went unnoticed until the oil light came on. He was afraid to drive it until he got some oil it, not a bad thing. We had some cheap conventional oil in the garage but I told him not to use it, to get synthetic like his car was already running. I honestly didn't know the answer to the question but decided it would be best to err on the side of caution. So the question really is this: is it ok to mix synthetic oil with conventional oil if you're just topping it off? Also is it a bad idea or does it not matter when it comes to the oil weights? Would be nice to know for future reference.