I don't think the idler pulley bearings are such a big deal. After 20+ years the lubricant has dryed out so they fail. Or the belt is too tight so they fail. The ordinary grade is more than sufficient but I guess it doesn't cost much to move up a grade if you want bulletproof. If you change the bearings every 10 years when you change the belt you would be very safe IMHO. How many people have anti-freeze in their "D" over 4 years!!!! Or hoses over 20+ years. Or brake fluid over 2 years!!! Parts are not meant to last forever but people neglect things until they fail. Just because you don't put much mileage on your car doesn't mean you don't have to maintain it. David Teitelbaum vin 10757 -- In dmcnews@xxxx, "dherv10" <dherv10@xxxx> wrote: > Group, Here is some info i found on the web about EMQ bearings. > John Hervey > Ningbo Ninghuan Twincam Bearing Co.,Ltd. is an enterprise which is > specialized in producing miniature bearings, small deep groove ball > bearings, water pump integrated bearings for automobiles, automobile > bearings, rolling mill bearings and other types of bearings with high > technology, named as Ningbo Miniature Bearing Factory before. The > miniature bearings are the bore diameter ranging from 3 to 12mm > (Metric series) or 1/8" to 1/2" (Inch Series). Our company pocesses > modern equipment and advanced technology. Our products are high > precision, long life and steadily reliability with strict quality > control system according to the standard ISO9000. > > Recently, we has been developed a new series of NII bearings which > are conformed to the EMQ electric motor's quality standard and could > be running in higher speed, more load and lower noise. The water pump > integrated bearings for automobiles include the structure of double > row balls, single row balls and single row rollers and as well > asangular contact. The fatigue life of the water pump integrated > bearings on rack testing rig which is specially designed for them > reached more than 2000 hours and fitted on automobiles, which ran 150 > thousands kilometers, the products were still in good condition > (measured by USA users). Our products sell well in domestic markets > and other countries such as USA, West-Europe, East & South Asia, etc > This tells a little more about bearings. > John