currently we are using Caltex Delo Gold for lubrication in our diesel engine.we drain after 300 hrs.we want to increase draining interval by using some other oil.Also we want equivalent of this oil from SHELL, MOBIL and any other company.

Lubrication Engineers LE8800 Ultra will comfortably do 1,000 to 1,500 drain intervals in conjunction with of oil analysis monitoring. The main constraint is the quality of the diesel fuel used and the ability of the filtration to remove the contaminants. (Note I don't like to use the forum to promote our products but you can have a look at the website and draw your own conclusions.)

www.le-international.com

Regards,

Another way to help with the extended drain interval is to make sure your filtration is highly affective. I am not associated with this product but have used it personally and in a few applications with work. Amsoil makes a very god bypass filter / main filter unit that can go down to about 1 micron. The main doesn't filter that fine, but it is the bypass portion. I'm also not sold on a brand because I have used several, but running a synthetic oil can dramatically improve the drain interval. Using this type of a set up, intervals can be increased by as much as 300%. But it can not be stressed enough how important oil analysis is.

Try any CH4 oils ,which will help you further to take it upto 500 hrs or 600 hrs.

Extending oil drain period must be done in conjuction with Oil condition monitoring.
2 points to bear in mind.
1/Use the highest spec oil suitable for the engine in question and from a reputable source.
2/Check out the oil at regular intervals to establish the safe extended oil drain period.
Note that by doubling the oil drain period you will double the wear metals which may exceed limits established for normal oil drains. This is to be expected.
Once established check at least once a drain period to see if contamination is OK(fuel soot water dirt)

I don't know for sure, but that DELO product should be a group II, even in your country. Chevron is usually pretty good about their name.
That being the case, without going to a synthetic, you have one of the best oils available. If analysis tells you to change at 300 hours, something else is wrong.
You don't mention the engine make, use, filters, etc. All of these have to be considered.
I have a group II CI-4 that I bring from the US that can easily pass 450 hours in most farm and construction equipment if good filters are used and injectors are in good condition.
Changing brands without finding the root cause will delay your getting to the problem.

You do not mention what engine make & model, also if it is in a heavy duty on highway or mining application.

To extend the oil drain interval you can either choose a higher specification oil such as a synthetic or semi synthetic meeting API CJ4 as the soot handling performance is very good. The viscosity increase is not as great as the soot content increases due to the improvements in dispersant chemistry.

As mentioned in the previous emails, regular oil analysis is the key to determining the performance of the oil and how much you can extend the drain interval as you would still want some buffer in the oil should you go over the drain period. One key point to remember is that if you increase the load on the engine eg add more trailers to the truck, pulling more load, steeper inclines etc. then you need to re-adjust the drain interval by decreasing it.

The other option is to increase the sump capacity - you may need to talk to your engine manufacturer.

As some of the other members indicate, your present oil is more than adequate to do your job. Consider adding a magnetic Coil onto your filter. Extending a drain interval should done by way of oil analysis. Consider the work situation before you consider extending a drain interval, and if you do extend the interval, it should be only done in small increments (10 - 20%). Check out your potential root causes for your failure and address it directly. A better oil may help, but generally, improved filtration works better and yields longer term results.
The following site might be of interest -
Halex Coil
Simply put - cleaner oils - guaranteed