Quote:
Originally Posted by Virtual Factoid
Not true. At least not in my car. I just did a quick test with a magnet with those bolts. I tried my test with other bolts while I was at it: the alternator bolts are definitely aluminum, whereas the VANOS solenoid bolts were steel.
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Head is aluminum, anything bolts to head (except magnesium valve cover '06 year valve cover bolts) are steel.
Oil filter housing bolts onto to the head, uses steel bolts.
Vanos solenoids bolt onto the head, they use steel bolts.
Intake manifold bolts onto the head, steel bolts.
Alternator bolts on to the magnesium outer jacket of the block, it uses aluminum bolts. Starter same, aluminum bolt. Knock sensors same, aluminum bolt and so on. Oil pan bolts on to magnesium bed plate, aluminum bolts. Accessory belt tensioner bolts onto the front outer part of engine, which is magnesium, aluminum bolt. The accessory idler pulley bolts onto the alternator, if my memory is correct, steel bolt, since alternator is aluminum itself.
Engine mount support brackets bolt onto magnesium outer jacket again aluminum bolts.
It is not arbitrary choice.