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Hum
06-07-2007, 12:17 AM
I am going to do my oil change soon and i have been using Royal Purple since day one. but my friend recently recommended Castrol Syntec. So i figured no harm in trying so i am going to switch over to Castrol Syntec 5w-30.

My question is with using these synthetic oils, which is the best filter to go with. and i know if i dont use OEM warranty is void (at least thats what Probart Mazda here in London told me).

thanks!!!

Wild Weasel
06-07-2007, 08:50 AM
Skarbro just posted some pointers about ensuring you use the right filter housing tool and what not. Be sure to read his post (that I'm too lazy to dig up and link to just this moment) before doing this.

I don't think they can void the warranty as long as whatever replacement filter you use meets the manufacturers specs.

WhiteSpeed3
06-07-2007, 08:55 AM
use a fram filter im pretty sure its CH9016 but i'v never had and problem with that filter

as for the oil castrol is very good but i dont know much about how good royal purple is

garboui
06-07-2007, 12:08 PM
i was at wally waorld yesterday and they have 5w20 in for both mobil1 and castrol syntec for the same price(37.99/5L). which would prolly be better?

Hum
06-07-2007, 12:48 PM
Well i heard Mobil 1 change their formula or something to Group III oil. im not sure at all. But my friend recommended i try Castrol Syntec.

Thanks for the input! i think ill go check out the Fram filters.

Skarbro
06-07-2007, 02:30 PM
I recommend using the Mazda OEM filters. They are very good.

MajesticBlueNTO
06-07-2007, 02:45 PM
if you use Castrol Syntec, the ONLY one that is a true synthetic is the Made in Germany 0w30 (commonly referred to as "German Castrol").

If you're weary about going to Mobil1 because they changed to Group III synthetic, then you wouldn't want to buy any other Castrol Syntec.

Hum
06-07-2007, 04:11 PM
So is 0W30 better in the summer. im not too sure about what the numbers mean.

MajesticBlueNTO
06-07-2007, 04:15 PM
So is 0W30 better in the summer. im not too sure about what the numbers mean.

0w30 and 5w30 are practically identical at operating temperature, winter or summer.

Kevin@nextmod
06-07-2007, 04:17 PM
Motul 8100 :)
Or Motul 300V

Hum
06-07-2007, 04:39 PM
lol i wish pearly. london doesnt have a big selection. there's only 1 place here with Royal Purple. i doubt i will find motul.

Skarbro
06-07-2007, 06:14 PM
So is 0W30 better in the summer. im not too sure about what the numbers mean.
I find this statement a little disturbing. If you don't know what the viscosity ratings mean, then how can you say 0w30 is better?

I use 5w20 in my car all year round. That's all you need. That's all that Mazda recommends.

MajesticBlueNTO
06-07-2007, 07:13 PM
I find this statement a little disturbing. If you don't know what the viscosity ratings mean, then how can you say 0w30 is better?

I use 5w20 in my car all year round. That's all you need. That's all that Mazda recommends.

lacking the question mark, he's asking a question not making a statement.

Skarbro
06-07-2007, 07:18 PM
Ah I see... :)

Wild Weasel
06-07-2007, 08:23 PM
Yeah, bad grammar but the intent was there to ask the question, not make the statement. :)

Hum
06-08-2007, 12:50 AM
yah sorry about that. lol. i dont really have a clue. but i did pick up some Castrol Syntec 0w30 today. and im going to stick with this one. lol i swear! no more mind changing.

rcd001
06-09-2007, 06:53 PM
5W30

The first number, commonly 0,5 and 10 are the oil vescoity. How thich is the oil is. The lower the number the better it is. 0 is very good for winter, as 10 is good for summer. Since late 90's many manufactures changed to 5w30 and now 5w20 to maintain fuel efficiency.

The last number(s), 20, 30, 50 are the temperatures the oils are rated for. The higher the number the higher the amount of heat the oil can handle. However, using a high heat rated oil but not running your engine at high temperatures is not good. Most oils have detergents that activate at the right temperature to losten up carbon so it will be trapped in the filter.

Mobil1 is a good oil, but whether you use mobil, castrol, or similar they are all the same. Mobil 1 is very popular because of all the racing endorcements. However, Castrol is the most common used for racing.

MajesticBlueNTO
06-09-2007, 07:03 PM
5W30

The first number, commonly 0,5 and 10 are the oil vescoity. How thich is the oil is. The lower the number the better it is. 0 is very good for winter, as 10 is good for summer. Since late 90's many manufactures changed to 5w30 and now 5w20 to maintain fuel efficiency.

The last number(s), 20, 30, 50 are the temperatures the oils are rated for. The higher the number the higher the amount of heat the oil can handle. However, using a high heat rated oil but not running your engine at high temperatures is not good. Most oils have detergents that activate at the right temperature to losten up carbon so it will be trapped in the filter.


partially right.

both numbers are viscosity ratings (not temperature ratings). the lower number is the viscosity and characteristic weight of the oil at a low temperature. the higher number is the viscosity and characteristic weight of the oil at a higher temperature.

this has been discussed before on the forum.