my thoughts as well. Why is everyone recommending 10w this and 10w that when Boxsters come from the factory with 5w-40?

I was told the "10" was for the climate you live. I live in Ohio and it starts getting cold well, like right frickin now, :eek: , If you live in Florida, arizona and other year round hot spots then you wouldn't want a "10" w40 but more like a 5 or less w 40

Careful using just the rating numbers as a means in which to decided what climates to use an oil. The first number is tested at 100F, the second at 210F. The numbers are only representative of the viscosities at those temperatures. At 0F, a 5W-40 could conceivably have a lower viscosity than a 0W-40. I've seen it happen, in fact. The viscosity/temperature relationship isn't always linear in an automotive motor oil.

212 is closer to where engines run on the high side, so it's safer to directly compare the 40 rating with the 30.

My 2000 Boxster S owner's manual lists 10w40 synthetic among the acceptable oil choices. Porsche has migrated to 0w40 and 5w40 more recently in order to (supposedly) improve fuel economy. The whole auto industry is moving to 5w and 0w oils for that reason. That doesn't mean that I have to do so, though.

Beware, any time I've used this product it has blown my seals. Result in an old Audi 5000, 4000 and 78' 924. I never use the stuff anymore. The black might be more than your oil.

Anybody using a quality synthetic oil shouldn't have to use stuff like this Gunk. Good oil has additives that "clean" the engine and remove buildup/deposits or prevents them from occuring in the first place.

I have to ask... why would you use it a third time if it blew out your seals twice before? :)

you may have read in an article i have posted in this section about oil in my inlet manifold

ive had major problems with my box ,and was begining to think the engine was a gonna

but ! the one thing i hadnt changed was the oil filter ,i changed the oil when i bought it ,but didnt have the tool to get the oil filter off and consdiering it had a major service 7months before thought i was being over cautous doing the oil change ,anyway i took the filter off ,and couldnt believe what i saw ,i should have taken a piccy for the forum

the filter cartridge was stuck in the filter housing with black silt ,it was like the kinda stuff you'd get from the bottom of a pond or river ,i cleaned it out ,cleaned around the filter housing,changed the oil(which was golden brown and looked normal) and stuck a new filter on

now this problem may have killed my engine as its not running right and has excessive blowby which i thought was the AOS ,i changed it and no difference

Its having a diagnostic ,comression test and camrea down its bore tomorrow

so we'll see what happens

maybe flushing it may have prevented this or made it worse?