First, I have never worked on cars before (am 48 years old) but will start doing oil changes. I bought this summer a '95 Land Rover Defender which has a 3.9L V8 1960s design Buick derived engine with a relatively new engine with 26K miles (83K miles on the chassis).
On the Defender forums, the thought is if an engine has been maintained on conventional/diesel (Rotella) oils, don't change to synthetic as this may encourage leaks. OTOH, if only synthetics have been used (as in my case), then continuing is OK.
The Defender Source forum members by and large recommend 3000 mile oil change intervals with conventional oils. Since I am using Mobil 1 Synthetic, am I wasting $$ unnecessarily by changing every 3K miles. Should I lengthen the intervals between oil changes to 5K or more or is the case that it doesn't matter what type of oil is used and 3K should be the interval no matter what? I'm using a larger capacity Wix filter and will be installing the No Spill system to make oil changes more easily. Diff Lock
On the Defender forums, the thought is if an engine has been maintained on conventional/diesel (Rotella) oils, don't change to synthetic as this may encourage leaks. OTOH, if only synthetics have been used (as in my case), then continuing is OK.
The Defender Source forum members by and large recommend 3000 mile oil change intervals with conventional oils. Since I am using Mobil 1 Synthetic, am I wasting $$ unnecessarily by changing every 3K miles. Should I lengthen the intervals between oil changes to 5K or more or is the case that it doesn't matter what type of oil is used and 3K should be the interval no matter what? I'm using a larger capacity Wix filter and will be installing the No Spill system to make oil changes more easily. Diff Lock