Agree that synthetic is the way to go
Thanks for that.
I have been a fan of fully synthetic oil ever since I saw the outcome of a US test and evaluation using Mobil 1 in a BMW.
They put the BMW on a dyno in a car park in New Jersey (not in a clean room type environment), and ran the US EPA test continuously during working hours but using higher top speeds, i.e. 80 MPH rather than 55.
The test went for years. The oil was changed at each 7,500 miles, and normal car maintenance performed.
They finished the test at 1,000,000 miles. The car used no oil between "services" for the first 400,000, and 25 litres over the full test.
They then pulled the engine down. The soft metal (e.g. bearings and rings) were just outside new limits, but well within service limits. The rest of the engine was still within new limits.
I could just imagine the advertisement for the car if they then sold it.
"Three year old BMW. Has never left the car park. Only 000005 miles on the clock. Bargain."
I recommend fully synthetic to everyone, unless they have an engine that leaks oil. I would not consider using anything else.