Many yrs ago, Car Talk Radio show said change oil every 4k - then we were using regular oil (not Full Syn).
So since I moved to Full Syn, I started doing it every 5k despite Mobil 1 tells me to do every 7k. Oil gets dark but color of oil should not be the factor. Another guy said that color gets dark because of the oil filter. So I used Wix but I do not think there is a change in color.
How often should I change my Mobil 1 5W30?
Which filter should I use?
Carbon build up - Valves
M/c tells me that my car has above avg carbon build up.
What really works to treat Carbon build up - DIY (other than having M/c using his specialized tools)?
It really depends on your engine. If it is DFI or not about the valves. I do not think the oil filter can do much for oil discoloration. Me when it looks dirty change it.
Type of filter: Ford type filters kept the oil looking new. General Motors was always dark. It was said that Ford used a sump type filter. I can’t remember who said it.
And, it is very important to note that it will state both an odometer mileage value and an elapsed time value, with the proviso of whichever comes first.
It doesn’t matter. Synthetic oil should be changed at the same interval that the mfr specified for conventional oil. Synthetic oil can be a definite advantage when you need to start the engine in sub-freezing weather conditions, it will probably provide better protection in very high temperature conditions, and it is less prone to viscosity breakdown, but it gets “dirty” at the same rate as conventional oil.
one can endlessly watch for how fire burns and water flows and … how “oil change intervals for SYNTHETIC (!!!) oil should be extended” gets discussed on cartalk.com
Not at all. If the car was spec’d for conventional oil and you use synthetic, it will only protect your engine better if you change at the manufacturer’s recommended mileage or earlier. It can’t hurt and it can only help. You can push longer if you want to, but that’s your decision.
As for filters, as long as it isn’t a cheap “white box” filter, most any of them will do just fine.
BTW, There is NO difference between GM AC Delco filters and Ford Motorcraft filters except size. They are virtually identical inside…
If the engine is not direct injection, no special treatment is required besides using good quality fuel. If it IS direct injection, an intake cleaning treatment every 30K miles may delay the inevitable walnut blasting of the intake valves. CRC and Seafoam both make products for this and they are DIY. Just follow the instructions or watch one of the many YouTube videos that present this.
That’s because it requires zero maintenance after 120k.
Seriously, though, when you pass 120k, just revert to the beginning of the maintenance schedule. If the first maintenance interval was… let’s say… 6k miles, then your next service would be 126k miles and should include whatever is listed for 6k miles.
Why not as I follow the logic - just spoke with Mobil guys. They say change it at 10k or 1yr. I have been changing 5k or 1yr. Half the recommended interval - I am very protective of my car.
