No it is not magnetic, itï¿½s just a plain bolt with an aluminum crush washer. Besides these Neodium magnets that they use now probably were not around in 1990.
Definitely not magnetic. There seems to be a push for these on the sump of the engine, however IMO this is largely a waste of time, thatï¿½s what you have an oil filter for. One the other hand there is nothing in the gearbox to stop any partials going round and round (apart from when you do an oil change) and everything in the gearbox is mainly ferrous metals (therefore attracted to magnets) so its perfect for the application.
I remember looking at my gearbox oil that I drained out last time and although it obviously looks as clean as the day you put it in, if you have a look at it under bright sunlight it looks like it has a million stars in it with the reflection of all the very tiny metal partials in it.
I got under the car tonight and checked my gear linkage bushes for wear and removed the top filler plug, which I'm sure is the same as the bottom drain plug. The thread is M18 x 1.5mm.
What was interesting is I have no wear in my shifter bushes at all. I can only attribute this to the lighter shifting action the Synthetic oil provides.
Cannot find a magnetic plug on any NZ website but there are a few on the US websites. Looks like this thread is used on engine sump plugs for some motorcycles. Am going to order a few from the USA if they get round to answering my e-mail request.
1990 Gen II GT Ceramic CT26 Hybrid @ 15psi
170.5 kW @ 6429 RPM 288.7 Nm @ 5430RPM
Gary Capper Performance - "Dynamic Test Systems" Precision Dynamometer