I have used these ramps extensively (id say at least 2 dozen times within the last 6 months). I have done exhaust work (downpipe install and reinstallation after dealer visits on my f10, muffler delete install and reinstallation after dealer visits on the f10, oil changes and other general work on a number of bmws ect). They are very reliable. Ive been under the car an average of 3 hours each time, with the car on ramps for days at a time in some cases and never felt my safety was compromised. I always chocked both back wheels, placed two jacks in either side of the car pressed against the frame , engaged the E-brake and used general common sense, however.
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