The most consice and appropriate summation ever posted! :clap:Basically I think as long as you have some oil, and change it occasionally (preferably before you run dry) you'll be ok.
Does your engine burn much oil?i was going to say, I just run synthetic because i don't need to change it as often. 10000 miles between oil changes is great. And I have enough other things to do to the range rover, I don't need to change the oil every month. every 3 months is much better. Yes I drive a lot.
Having a look on the net i've found that the USA does fully synthetic oils 10w40, the UK doesn't. Typically, fully synthetics in the UK don't come any heavier than 5w30, although Mobil do a 10w60 fully synthetic for older engines.no, it only leaks a little out of the rear main as well. i use 10w40 mobil 1. although this next oil change i'm switching to Rotella T 5w40 synthetic. I want to see if it makes any difference. its a diesel synthetic.