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Just bought the OTC 2-ton aluminum jack myself from Amazon (
http://www.amazon.com/OTC-1532-Capacity-...B000XSCEBM). I'm impressed with the heavy duty build quality and it has 3 1/2" clearance - plenty to get under my M030 car which is lowered all the way. It also comes with a lifetime warranty.
As many say and it can't be stressed enough - NEVER work under the car using the jack alone. ALWAYS put jack stands in place. A very important lesson to teach your son for his oil changes.
I had a cheap craftsman jack that had 5" of clearance and would just barely not fit under. The craftsman aluminum jacks get terrible reviews on their website...
Whatever you do - I would highly advise getting an aluminum jack as some of those other low profile jacks weight 90+ lbs (versus the ~45-50lbs of aluminum)!
1994 Slate Grey M030 Coupe
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I have a 3 ton (definitely overkill) that I bought at either Sams Club or Costo years ago which has served me well. It's definitely a bit heavy to haul to the race track, but other than that has worked great. With the round piece off, it easily fits under any of the lift points that I use on the car. Only thing I need to get is one of the round plugs that will make it a bit safer to lift with. And, always put a stand under before getting under the car.
'92 Midnight Blue 968 Coupe
'94 ProbeGT, Eaton SC@9psi, Quaife, TecGT ECU, 300+HP, body sold, parting out
'98 3000GT VR-4, 400+HP AWD beast, didn't fit w/race helmet, Sold
'93 Bone Stock MX-6 Sold (in '05) sadly to the crusher in 2010
'61 Triumph TR-3, White with red leather interior; My First Car
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I have a 2 ton AC Delco that has had sufficient clearance for all of my vehicles except the M030 coupe. Flash made reference to the puck size which is removable in mine and can fit a jack pad to protect your vehicles underbody and make lining things up easier. Here are some pictures:
'95 968 Cabriolet w/ D1R Stage 3 Supercharger + other goodies! Previous Porsches: '86 944 turbo, '87 944 turbo parts car, '91 944 S2 Cab, '93 968 Coupe M030, '95 968 Coupe Tiptronic, '95 968 Coupe <acronym title='Limited Slip Differential'>LSD</acronym>, '98 Boxster, '00 Boxster, '00 Boxster S.
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The steel ones show ref. to ANSI standards. I would purchase these over the alum ones for that reason. The footprint of the alum ones also looks small for the height that you can extend them too which isn't great.
'92 Midnight Blue 968 Coupe
'94 ProbeGT, Eaton SC@9psi, Quaife, TecGT ECU, 300+HP, body sold, parting out
'98 3000GT VR-4, 400+HP AWD beast, didn't fit w/race helmet, Sold
'93 Bone Stock MX-6 Sold (in '05) sadly to the crusher in 2010
'61 Triumph TR-3, White with red leather interior; My First Car