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My point is that with most engines you have a choice. Every car I've worked on had a single recommended weight oil which is probably considered ideal for most operating conditions. You will also notice a bar chart in your manual that shows alternative oils which can be selected for use in different operating conditions. It typically shows each acceptable oil viscosity with a temperature range that it can be used in. Personally, I would try and stick to what's in the chart despite what anyone else tells you, as the manufacturer has likely tested those oils for your type of engine.
hmamontov, you probably hear of folks in your area using heavier weight oils because engines run hotter in the Florida climate, which thins out the oil more. In the NE where I live, some folks put a lighter weight oil in for the winter when the stuff gets thick in the cold. I used to have an old Pontiac V-8 which liked 5W-30 when the temperature dropped below 20, because it had a very worn and tired valvetrain. 10W-30 was the manufacturer recommended weight, but 5W-30 and 10W-40 were on the chart for lower and higher operating temperature ranges, respectively.
What brand of oil? That's tough to say. I think that decision should be based more on quality and availability of the product than what make of car you drive. I like Mobil1 because it's considered by most to be a high quality synthetic, and it's easy to get in my area (although more costly than most others). There's some discussion about various synthetic oils on the Probe/MX6/626 FAQ at:
Definitely check out the site even if you use a mechanic to maintain your 626. Whoever put it together really seems to be very knowledgeable about Mazdas. I've used the site a few times to perform maintenance on my 626 (not ready to fork over $100 for the factory shop manual yet), and I've found it to be very accurate and thorough.
'14 CTS Vsport; '15 Fit LX 6-spd; '98 Volvo S70 base; '14 Town&Country Limited
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