SteveTheTech wrote:There is no legal way they can require you use their oil after you have already purchased the car. As this thread covers using a premium oil should suffice. I personally feel that acceleration is smoother and faster with ester, that might be in my head I have no numbers.
I did an oil change using Ester at about 13500 on my 08 XS. I figured if this stuff is better lubrication wise that this may translate into better mpg.
Now it is possible that other factors (such as summer blend gas, etc) have come into play but over the last 1000 miles I am now getting 23.0 where I was getting 21.9 . My target was 1 mpg . I figured this would easily pay for the difference between a $120 oil change and one costing about $50. My plan is doing oil changes at 5k although I believe this is probably twice as often as needed. Part of this reasoning is to make sure I am ahead of the curve of a 7500 schedule for warranty purposes, part is 5k is easy to remember, and part is due to making sure the oil filter is changed often enough even if the oil chemistry is still good.
Some studies show that changing the oil filter is the key. That modern oils in modern engines can go as much as 25k without issues with the oil itself. I figured that this may be where the magic number of 15k comes into play with BMW. We of course can not easily do oil analyses so we rely on some other magic time or mileage periods.
I believe in using a filter with anti drainback features and with a bypass.
To me the issue with the bypass is that oil flow is better than no oil flow in a street car with average drivers. However because it is a street car there is no easy way to sense bypass mode so the best insurance is to do frequent enough changes using a quality filter. On a new car with average drivers 10 k is probably fine but 5 k pretty much guarantees it. Sensing bypass is actually fairly easy to do but configuration basically would require adapting something like an external oil cooler adapter for the job.
I also believe most could benefit from a partial bypass filter which will filter much finer particles. The drawback being that any failure of the engine can instantly escalate into a full blown event before an average driver senses anything occurring.
So back to the Ester, from what I have seen so far, at $12 a quart I believe it should be a break even procedure (based on standard oil change prices) and it stands to reason if what I have seen so far holds true should pay off in the long run in longevity.
Perry