Before getting too hung up on the 7,500 mile recommendation note that Suzuki have changed that to 15,000km or 9000 miles so there's nothing magic about 7,500.pushing the oil chaange beyond the 7,500 miles recommended in the owner's manual under "normal" service is exactly what will lead to denied warranty claims.
The only reasons BMW's (and therefore MINI) can go 16,000 miles between oil changes is that they use LOTS more oil*
$50??? Its cheaper than that at the dealer.....it is at our dealership anyways.I've always been A "every 3K" guy, but I went synthetic, and now change every 7,500 miles. While expensive (50.00 at my local shop, and the local Walmart), I'm seeing my milage go up around 1.25 miles. I thought the 7,500 mile recomendation for a 4 cyl is little off, way to much breakdown after 5K
I've always felt that the time limit for an oil change is more of a guideline for people who drive "average" milage (12-15k per year), so they have a milage and an approximate timeframe to get the oil changed. God knows this still doesn't help people get their oil changed (I just changed out the factory oil and filter from a Forenza with 17,000 miles on it).I can understand the manufacturers putting a mileage limitation (say 7,500 miles) for an oil change. Obviously the oil's qualities break down with use.
However, why have a time limit (say 7.5 months)?