The gallon of Castrol is the same whether you buy it at CT or Napa.
Pros: same quality, good brand
Vehicle:
Mazda 3
Best Engine oil for Mazda 3
Could be weather related. I'm in Canada and we have weather from -35C to +35C, so Mazda recommends oil changes every 8000km instead of 12,000km.
Vehicle:
Mazda 3
Mileage: 8000 km
SOOOO I've always used full synthetic way before most vehicles started recommending it from the manufacturer. I've ran mobile 1, royal purple, and a few others. When we got our 2007 Mazda 3 all of the records/receipts showed conventional Castrol was used. I've stuck with it to see how it do... I've increased the weight "one step" because we live in a hotter than average climate but we just hit 290k miles with not major issues... my average MPG is 31.x and I typically do 10 over the speed limit (so it could definitely be improved).I change it myself every 5k miles. I think the frequency is more important than the quality with oil. I'd rather have super tech every 3k than mobile 1 every 10k. I think if you stick with any major brand, use a good filter, and change it regularly you'll be fine.
Pros: 290k miles, no major issues
Cons: MPG could be improved
Vehicle:
Mazda 3
Mileage: 290000 km
I use Castrol Edge High Millage and a STP XL filter or Mobil 1.
Vehicle:
Mazda 3
I use Madza OEM filter with Pennzoil Ultra Platinum 0W-20 every 8,000 km to 10,000 km.
I personally like the Pennzoil over the Idemitsu high moly oil but it's mostly due to being more available in my area.
I do think the Pennzoil is slightly better fuel economy wise and comes out cleaner than the high moly but this is probably a placebo than anything.
Pros: better fuel economy
Vehicle:
Mazda 3
Mileage: 10000 km
The oil was Idemitsu Synthetic 0W-20 with 12.5k miles on it. Once again, trace metals and flashpoint were within normal range. I also ordered a TBN to measure the amount of additive left and that showed there was still plenty of active additive remaining.
Pros: trace metals normal range
Vehicle:
Mazda 3
Mileage: 12500 km
I've always had great luck running 0w-20 Mobil 1 through my 2012 skyactiv. Regular changes through 130k and counting.
Pros: great luck, regular changes
Vehicle:
Mazda 3
Mileage: 209215 km
Eneos 5w-20 in my 2008 2.3 liter Mazda3. It's a Japanese-branded synthetic oil that you can get from Napa Auto. I've found that with Eneos, my Mz3 stops consuming any oil (in both my 2007 and 2008 2.3's).
Pros: stops oil consumption
Vehicle:
Mazda 3
Mileage: 181000 km
Although this is exact replacent, mazda OE still uses Mazda branded GF-5 which is exactly the same oil but branded Mazda....
Love these high molly low viscosity oils. Absolutely the best out there
Pros: high molly low viscosity
Vehicle:
Mazda 3
That's the wrong oil. You want the Idemitsu eco gold medalist advanced moly 0w-20, which is basically the same as Mazda oil(Idemitsu makes the mazda oil).
Pros: basically the same
Cons: wrong oil
Vehicle:
Mazda 3
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