Reply With QuoteBosch or NGK, stay away from platinum or so called performance plugs. The stockers are about the best you can get!
Grand Master
Which spark plugs to suit 535iA?
Any suggestions? Platinum? Non-platinum? etc.
1990 E34 535iA, 215,000kms (130,000 miles).
Dual Climate, Rear Headrests, Rollerblind, M-Tech Wheel,
Memory Seats, EAT Chip, T-Stars.
Green Beret Special Ops
Bosch or NGK, stay away from platinum or so called performance plugs. The stockers are about the best you can get!
95 E34 530I V2.37
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Those who make peaceful revolution impossible will make violent revolution inevitable.
John F. Kennedy
5-10 Grand Master
bosch super W8LCR, i run mine at 28-30 others run a wider gap
all america wants is cold beer warm cat and a place to take a poop with a door on it
Green Beret Special Ops
mine have 4 (i think) terminals on mine, guess id concider them un-gapable.
95 E34 530I V2.37
===========
Those who make peaceful revolution impossible will make violent revolution inevitable.
John F. Kennedy
3 Grand Master
aren't the four terminal ones the plattys?
Grand Master
Listen to Winfred, the Bosch Super W8LCR is the plug you want to run in the 535. The fancy plugs cause nothing but trouble with the 535.
Jr
5-10 Grand Master
you should be running bosch F7LDCR or NGK BRK6EK both are twin electrode non gappable, same plugs for the m42/44/50/52/60/62 and 850 volvo
Originally Posted by 632 Regal
all america wants is cold beer warm cat and a place to take a poop with a door on it
Grand Master
ditto Winfred and Jr. I would only run the stock Bosch spec W8LCR and gap them on the low side at .028". Also make sure your socket wrench is square while extracting and putting the plugs in....engine is cold and do not overtorque...you should feel the crush washer bottom and that's it...sensitive aluminum threads in the head.
George
Super Moderator
I run the standard ngk or bosch supers like Winfred Jr and George, but the stock
gap spec is .028 to .032 and i set mine to .032 to .034 for a smoother idle and a little higher firing voltage.
Grand Master
Thanks guys. I'll go with either the Bosch or NGK. I must admit I have had more success with NGK's over the years. I've adjusted the valve clearances last weekend at a 'loose' .012" cold. I'm experiencing a slightly unsteady idle, not exactly rough, but as I said 'unsteady' is the best word to describe it. I used to have an old MS55 Toyota Crown fitted with a 5ME SOHC 2.8 liter engine which idled like a Swiss watch. In fact I could stand an Australian 50 cent piece on the valve cover with the motor idling and it would sit there as steady as a rock without falling over... No B.S.! After I change the plugs I'll check for vacuum leaks. I believe the M30's aren't the worlds smoothest idling engine though once you wind it up on the road it really is very nice!
1990 E34 535iA, 215,000kms (130,000 miles).
Dual Climate, Rear Headrests, Rollerblind, M-Tech Wheel,
Memory Seats, EAT Chip, T-Stars.
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