Well it's been 6 months since i put the bosch platinum +4's in my 325i e36.
6 months ago...
1st impressions: the car roars like never before, and it seemed to give a slight performance gain. Gas mileage actually was worse with these in, and it seemed to stall the car just a bit when first stepping on the gas. (nothing too bad, but there's more...)
Final impressions: Well that was 6 months ago, and today i decided to look at my spark plugs as i wanted to put my NGK's back in to try them out (for better gas mileage). I took out the bosch's and they were COVERED in soot! They were burnt black, and were all gummed up! One didn't even look like it was firing properly at all
I have lately been noticing a bad performance loss, and couldn't figure out where it was comming from, but it was from these darn plugs! I switched back to my NGK's from the dealer, and the car is running smooth as ever! I can really feel it behind the wheel how much smoother the car runs. I dont even get any more backfiring when engine braking.
All in all, i thought i liked the bosch's alot, but now that i see how poorly they were actually running, i'm glad i took them out.
Thankfully bosch is offering to give me a refund of my money if i mail them back to them.
How is everyone's impressions of the NGK platinums?