Originally Posted by mullethunter3
In person, does plug #1 look very white in comparison to plug #4?
Also, I've heard that oil (on #6) can find it's way above the spark plug. Personally, I've never had that problem, but a DIY on Pelican Parts says that it's not necessarily a huge deal.
For reference, I always use Mobil Clean 5000 (10W-40). I change my oil every 2500 - 3000 miles. My car has 146,000 miles on it and the car burns absolutely no oil, but then again, that could be an M42 thing.
Edit: Can I ask why you changed to Bosch +4 plugs?
thanks mullet. do you happen to have a link for that diy on pelican or the name of the article?
plugs 1 and 4 look pretty much the same. it may look more white in the pic because i might have used a flash on that one. i change my oil every 3k miles too, and it is 10-30, i have no idea why i thought it was 5-30. your M42 is a good bit more technically advanced than my M20 from what i understand so maybe that is a factor too.
i knew someone was gonna ask about the +4's. i did a lot of looking around as to why people didnt like the +4's and from what i found it was mostly people with M5x engines with the ignition coils/plasma injectors or whatever the heck they have. other people have used them in their M20's and M30's and they were ok. in my previous E30 i tried both bosch silver's and the +4's and i noticed slightly better performance (altho this is relative and IMHO i suppose), but no negative effects have come up in the 60k miles plus that i have used them for.
thanks elsa, i appreciate it. lemme know what your friend says.