This is a 97 Miata that we have owned from new. It is my wife's driver and sees 70% city use and short trips. The only unusual item here is that this is an 11 month sample to get to 4.5K. Oil filter is Denso 150-1011. I had a lifter tick (hydraulic adjusters) when cold with RTS (the previous fill) and this was fixed with the M1 0w-40. The last sample I ran was at 10/2008 and showed a slight coolant leak that prompted me to replace the head gasket. No coolant leak this time! No additives in the oil, I run MMO in every gas fill (93 octane).
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OIL M1 0W-40
MILES IN USE 4.58k
MILES 192.9k
SAMPLE TAKEN 7/20/14
ALUMINUM 3
CHROMIUM 0
IRON 8
COPPER 3
LEAD 1
TIN 1
MOLYBDENUM 68
NICKEL 0
MANGANESE 0
SILVER 0
TITANIUM 0
POTASSIUM 3
BORON 118
SILICON 5
SODIUM 5
CALCIUM 2728
MAGNESIUM 110
PHOSPHORUS 966
ZINC 1082
BARIUM 0
INSOLUBLES 0.2
WATER 0
FUEL <0.5
FLASHPOINT ºF 385
SUS VIS 210ºF 69.3
cSt @ 212ºF 12.77
