My sister's 2002 ES300 (93K mileage, well maintained): Local 'stealer' says all 4 engine mounts need replacement, at approx $1600. There is no vibration or problems noted, and car is cautiously driven in city driving...continue ops, or am I missing something? Mucho ThanX in advance, Bill (Cert. FAA Acft. mechanic, BWDIK)